LiveActive security incident?Get immediate response
CVE Record

CVE-2018-21183: Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user.

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R7800 before 1.0.2.40, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.92, and WNDR4300 before 1.0.2.94.

MediumCVSS 6.8Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE affects specific NETGEAR router models running older firmware. An already authenticated user on a nearby network could trigger a stack-based buffer overflow, potentially compromising confidentiality, integrity, and availability. The business risk is meaningful where these routers are still deployed and administration access is weakly controlled.

Executive priority

Prioritize remediation for affected routers that remain in service, especially in branch, small-office, or remote-site environments. This is not supported as actively exploited here, but the potential impact is high if an authenticated nearby attacker reaches router administration.

Technical view

CVE-2018-21183 is a post-authentication stack-based buffer overflow affecting NETGEAR R7800, R9000, WNDR3700v4, and WNDR4300 below listed firmware versions. CVSS 3.0 is 6.8 with adjacent network access, low complexity, high privileges, no user interaction, unchanged scope, and high CIA impact.

Likely exposure

Exposure is limited to the named NETGEAR router models on vulnerable firmware: R7800 before 1.0.2.40, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.92, and WNDR4300 before 1.0.2.94.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. The CVSS vector indicates exploitation requires adjacent network access and high privileges, so risk rises when router administration credentials or local network access are poorly controlled.

Researcher notes

The public bundle provides affected models, fixed firmware thresholds, CVSS vector, and vendor advisory reference. It does not include exploit details, root cause specifics beyond stack overflow, CWE mapping, or evidence of exploitation in the wild.

Mitigation direction

  • Upgrade affected NETGEAR models to the fixed firmware version or later.
  • Review the NETGEAR advisory for model-specific update guidance.
  • Restrict router administration access to trusted administrators and trusted networks.
  • Remove or disable unnecessary administrator accounts.
  • Monitor vendor guidance for any newer security instructions.

Validation and detection

  • Inventory deployed NETGEAR R7800, R9000, WNDR3700v4, and WNDR4300 routers.
  • Compare installed firmware against the fixed versions listed in the advisory.
  • Confirm management access is limited to authorized administrators.
  • Review router administrator accounts for unnecessary or stale access.
  • Document any unsupported or unpatched devices for replacement planning.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2018-21183 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.8CVSS 3.0MediumCVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N0.95.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.8Medium
CVSS 3.0 vector shape for CVE-2018-21183Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.